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新东方-柯林斯雅思备考词典
BC
英 [ˌbiː ˈsiː]
又拼作 B.C.
1. 公元前
You use BC in dates to indicate a number of years or centuries before the year in which Jesus Christ is believed to have been born. Compare AD.
双语例句
例：The brooch dates back to the fourth century BC.
这枚胸针可追溯至公元前4世纪。